pypershaw pypershaw
  • 23-10-2020
  • Mathematics
contestada

- 2x + 3y = 14
x + 2y = 7

Respuesta :

unicorn3125
unicorn3125 unicorn3125
  • 23-10-2020

Answer:

          x = -1 ,   y = 4

Step-by-step explanation:

x + 2y = 7   ⇒  x = 7 - 2y

- 2x + 3y = 14

- 2(7 - 2y) + 3y = 14

-14 + 4y + 3y = 14

-14 +7y +14 = 14 +14

   7y = 28

     y = 4

x = 7 - 2y = 7-2(4) = 7 - 8 = -1

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